Hi, I have two tables that is one to many. I have notice that users work with DGV's like MS Excel.. In DGV they leave many blank rows and this looks bad in reports..

So I have change DGV's to "Allow users to add rows" to FALSE and insert button where user must now click to add row:

So this is better. And looks like this:

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When user click button:

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Again this is better. But now what if user keeps clicking button? I not want this:

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How can I:

1- Prevent insert more blank row if there blank row already? (when button is click)
2- Because there is 2 tables (one-to-many) there is 2 DGV's I want prevent save (if save button is click) if there is blank rows in any of this 2 DGV's